MUSKEGON TOWNSHIP, Mich. (AP/WZZM) -- Police say a West Michigan man stabbed his father to death before fatally shooting himself following an argument about a new business venture.

Muskegon Township police Chief Ken Sanford says 30-year-old Justin Laverty and 57-year-old David Laverty were working on a swimming pool at a home Thursday. During the project they argued over a new business the father planned to launch.

WZZM 13's Jon Mills reports that there was a history of physical abuse in the family. Watch the video for those details.

David Laverty's wife left the home in Muskegon County's Muskegon Township to run an errand. She arrived home in the afternoon to find both dead.

Police say Justin Laverty apparently stabbed his father with a knife then went into an upstairs bedroom and fatally shot himself in the head with a shotgun.